STUDEIS ON PROPERTIES OF GROUNDNUT GROWING SOILS OF U.K.P (PHASE -I) COMMAND AREA
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Date
19-08-98
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A sutdy was underteken on groundnut growing red & black soils of UKP (Phase-I)
command area in North - eastern dry zone of Karnataka to understand the moiphological,
physical and chemical properties and to evaluate their suitability for irrigation and fw cultivation
of groundnut
Five pedons and fifteen surface soil samples derived from granite gneiss were studied
and a lime stone derived black soil pedon was also included for comparision. The soils were
deep to veiy deep , sandy loam to loamy sand in texture with colour hue of 2.5YR and 5YR
with weakly to moderately developed subangular blocky structure. Red soil contained high
sand and low silt content Clay movement was apparent in Narayanpur, Kodekal and kakkera
pedons where as Huansigi pedon was clayey throughout the depth. The moisture retention
at 33kPa and 1500kPa followed the trend of clay in all the pedons.
The pH varied from slightly alkaline to moderately alkaline and increased with depth.
The exchangeble calcium was the dominant cation followed by magnesium, sodium and
potassimn in all the soils.
The available nitrogen content ranged from 123 to 296 kg / ha. The available phos
phorous and potassium was medium. The uptake of N was more in red soils than black soils
but no such difference was noticed for P and K,
A high positive correlation between availabile N , P, K and Calcium of soils and tbeir
uptake in kemals was observed. The pod and kemal yield was more in red soils than black
soils.
The soil suitabibty evaluation for groundnut was attempted based on climatic and
soil requirements. The overall suitability was rated as suitable (S2) and sligthly suitable (S3)
soils for groundnut in respect of red and black soils, respectively.